To anyone who has been reading anything on the web over the past few months, this shouldn't come as a surprise. Barnes & Noble is currently embroiled in a patent lawsuit started by Microsoft, after the bookseller/tablet maker refused to pay protection money to Redmond. Barnes & Noble has now openly said what we already knew, and has filed an official complaintat the US Department of Justice: Microsoft is engaging in anticompetitive practices. Update:Here's the slide deck B&N presented to the DoJ.